【多选题】从网站 客源角度 , B2C 电子商务模式可划分为( ).
【单选题】When your parents __________ at theairport, please call me.
【简答题】Either you or one of your students ______ to33. Either you or one of your students ______ to attend the meeting that is due tomorrow. A. are B. is C. have D. be
【判断题】采购过程中风险不大,不需要事前采取防范措施。
【单选题】Are they your _______? [ ]
【判断题】奥迪、桑塔纳轿车配用的交流发电机,既有励磁二极管,又有中性点二极管。( )